Remote-sensing calculation method of long-term variation of suspended sediments of strong-tide high-turbidity estuary

A calculation method and long-duration technology, applied in the measurement of color/spectral characteristics and scattering characteristics, etc., can solve the problems of high cost, little measured historical data, and it is difficult to effectively analyze the long-term spatial and temporal variation characteristics of suspended sediment in the estuary. Observing the effect of high cost

Inactive Publication Date: 2019-01-29
ZHEJIANG INST OF HYDRAULICS & ESTUARY
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Problems solved by technology

For the calculation and analysis of the long-duration changes of suspended sediment in strong tides and high turbid estuaries, there are few historical measured data, and the

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  • Remote-sensing calculation method of long-term variation of suspended sediments of strong-tide high-turbidity estuary
  • Remote-sensing calculation method of long-term variation of suspended sediments of strong-tide high-turbidity estuary
  • Remote-sensing calculation method of long-term variation of suspended sediments of strong-tide high-turbidity estuary

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[0035] The present invention will be further described below in conjunction with the roadmap of the description, but the present invention is not limited to the following examples.

[0036] 1. Strong tidal high turbid estuary area: The strong tidal high turbid estuary of the present invention is the Qiantang River estuary Hangzhou Bay.

[0037] The Qiantang River estuary Hangzhou Bay is a typical trumpet-shaped strong tidal estuary. The Luchaogang section at the bay mouth is 98.5km wide, and the Wanding Panpu section is 16.5km wide, with an area of ​​about 4800km 2 . The average tidal range at the mouth of the bay is 2-3m, and gradually increases to 5-6m towards the top of the bay. The average tidal range at Ganpu is 5.66m for many years, and the maximum tidal range is 9.0m, ranking first among tidal estuaries in my country. Under natural conditions, the sediment exchange inside and outside Hangzhou Bay is very active, and the measured maximum sediment concentration during sp...

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Abstract

The invention discloses a remote-sensing calculation method of long-term variation of suspended sediments of a strong-tide high-turbidity estuary. The method comprises the following steps: step S1, receiving Landsat satellite remote-sensing data in different years and the same hydrological condition; step S2, processing the remote-sensing data; step S3, carrying out spectral measurement above spring/neap-tide water surfaces, carrying out synchronous surface layer suspended-sediment sampling, obtaining remote-sensing reflectivity, analyzing wavebands where spectral curve peak values are located, selecting waveband data which are of different sensors on Landsat and correspond to reflectivity peak values, establishing a statistical regression model between surface layer suspended-sediment concentration and remote-sensing reflectivity corresponding to sensitive wavebands, and then obtaining an optimal calculation mode of quantitative remote sensing through accuracy verification calculation, wherein wavebands corresponding to the peak values are the sediment sensitive-wavebands; and step S4, applying the optimal calculation mode, which is of quantitative remote-sensing and is obtained in the step S3, to the remote-sensing data after processing in the step S2, obtaining remote-sensing data of the suspended sediments of all regions in the different years and the same hydrological condition, and carrying out analysis of long-term variation of the suspended sediments.

Description

technical field [0001] The invention relates to a calculation method for estuary sediment changes, in particular to a remote sensing calculation method for long-duration changes of suspended sediment in strong tides and high turbid estuaries. Background technique [0002] Suspended sediment, as a key environmental element of water bodies, is the main factor affecting the landform shaping of estuaries and bays and the evolution of shore beaches. In recent decades, due to the influence of natural changes in the river basin and human activities, the suspended sediment in the estuary has undergone profound changes under various pressures, which will have a profound impact on the protection and governance of the estuary. [0003] Strong tides and high turbid estuaries are affected by various factors such as the confluence of rivers and seas, the confluence of salt and fresh water, tides, wind and waves, etc., resulting in large fluctuations in estuary sediment and drastic tempora...

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Application Information

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IPC IPC(8): G01N21/25G01N21/55
CPCG01N21/25G01N21/55
Inventor 张伯虎吴修广潘冬子孙超陈刚吕振华胡成飞郭巨海
Owner ZHEJIANG INST OF HYDRAULICS & ESTUARY
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